You can combine `dataclasses` with other type annotations in many different combinations to form complex data structures.

Check the in-code annotation tips above to see more specific details.

## Learn More

You can also combine `dataclasses` with other Pydantic models, inherit from them, include them in your own models, etc.

### Translations

Help with translations is VERY MUCH appreciated! And it can't be done without the help from the community. 🌎 🚀

Here are the steps to help with translations.

#### Tips and guidelines

    Support the open standard for APIs, OpenAPI.

### <a href="https://flask-apispec.readthedocs.io/en/latest/" class="external-link" target="_blank">Flask-apispec</a>

It's a Flask plug-in, that ties together Webargs, Marshmallow and APISpec.

It uses the information from Webargs and Marshmallow to automatically generate OpenAPI schemas, using APISpec.

## The main `FastAPI`

Now, let's see the module at `app/main.py`.

Here's where you import and use the class `FastAPI`.

This will be the main file in your application that ties everything together.

And as most of your logic will now live in its own specific module, the main file will be quite simple.

### Import `FastAPI`

You import and create a `FastAPI` class as normally.

* 📝 Add External Link: 10 Tips for adding SQLAlchemy to FastAPI. PR [#11036](https://github.com/tiangolo/fastapi/pull/11036) by [@Donnype](https://github.com/Donnype).
* 📝 Add External Link: Tips on migrating from Flask to FastAPI and vice-versa. PR [#11029](https://github.com/tiangolo/fastapi/pull/11029) by [@jtemporal](https://github.com/jtemporal).

* News about FastAPI and friends 🚀
* Guides 📝
* Features ✨
* Breaking changes 🚨
* Tips and tricks ✅

## Follow FastAPI on Twitter

<a href="https://twitter.com/fastapi" class="external-link" target="_blank">Follow @fastapi on **Twitter**</a> to get the latest news about **FastAPI**. 🐦

    author_link: https://github.com/Donnype
    link: https://bitestreams.com/blog/fastapi-sqlalchemy/
    title: 10 Tips for adding SQLAlchemy to FastAPI
  - author: Jessica Temporal
    author_link: https://jtemporal.com/socials
    link: https://jtemporal.com/tips-on-migrating-from-flask-to-fastapi-and-vice-versa/
    title: Tips on migrating from Flask to FastAPI and vice-versa
  - author: Ankit Anchlia